198259954181 has 2 divisors, whose sum is σ = 198259954182. Its totient is φ = 198259954180.

The previous prime is 198259954169. The next prime is 198259954219. The reversal of 198259954181 is 181459952891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 167649302500 + 30610651681 = 409450^2 + 174959^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198259954181 is a prime.

It is a super-2 number, since 2×198259954181² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198259254181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99129977090 + 99129977091.

It is an arithmetic number, because the mean of its divisors is an integer number (99129977091).

Almost surely, 2^198259954181 is an apocalyptic number.

It is an amenable number.

198259954181 is a deficient number, since it is larger than the sum of its proper divisors (1).

198259954181 is an equidigital number, since it uses as much as digits as its factorization.

198259954181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9331200, while the sum is 62.

The spelling of 198259954181 in words is "one hundred ninety-eight billion, two hundred fifty-nine million, nine hundred fifty-four thousand, one hundred eighty-one".